-49.88% is the change from 842 to 422
Calculation steps:
[( 422 - 842 ) ÷ 842] x 100 = -49.88%
Formula
Percentage change = [(422 - 842) / 842] x 100
Subtract the new number by the original number
422 - 842 = -420
-420 ÷ 842 = -0.498812351543943
-0.498812351543943 x 100 = -49.88%